... arm for projector). Can be installed together with traditional black board or green board form a combination board.4. ... :1. Two point touch Gesture control: screen moveable, previous page, next page, select, rotate, zoom in/out, eraser.2. Use ... 14. Searchlight, camera, Screen cover.15. Background for teaching: black page, green page, letter paper, football field, basketball field, Staves for music ...